package 寒假作业.LeetCode;


import java.util.Map;

public class Num2 {
    public class ListNode {
        int val;
        ListNode next;
        ListNode() {}
        ListNode(int val) { this.val = val; }
        ListNode(int val, ListNode next) { this.val = val; this.next = next; }
    }

    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode prev = new ListNode(0);
        ListNode cur = prev;
        int carry = 0;
        while (l1 != null || l2 != null){
            int value1 = l1 == null ? 0 : l1.val;
            int value2 = l2 == null ? 0 : l2.val;
            int sum = value1 + value2 + carry;

            carry = sum / 10;
            sum = sum % 10;
            cur.next = new ListNode(sum);

            cur = cur.next;
            if (l1 != null){ l1 = l1.next;}
            if (l2 != null){ l2 = l2.next;}
        }
        if (carry >= 1){
            cur.next = new ListNode(carry);
        }
        return prev.next;
    }
}
